单词 | placoderm |
释义 | Word Frequency placoderm(ˈplækəˌdɜːm) noun any extinct bony-plated fishlike vertebrate of the class Placodermi, of Silurian to Permian times: thought to have been the earliest vertebrates with jaws Word origin C19: from Greek plac-, plax a flat plate + -derm |
随便看 |
英语词典包含233703条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。